BufferedImage
我正在尝试使用BufferedImageOp
该类实现用于反转每个像素的蓝色部分的算法,如此处所述。我的尝试导致了这种方法的创建:
private BufferedImage getInvertedVersion(BufferedImage source) {
short[] invert = new short[256];
short[] straight = new short[256];
for (int i = 0; i < 256; i++) {
invert[i] = (short)(255 - i);
straight[i] = (short)i;
}
short[][] blueInvert = new short[][] { straight, straight, invert }; //Red stays the same, Green stays the same, Blue is inverted
BufferedImageOp blueInvertOp = new LookupOp(new ShortLookupTable(0, blueInvert), null);
//This produces error #1 when uncommented
/*blueInvertOp.filter(source, source);
return source;*/
//This produces error #2 instead when uncommented
/*return blueInvertOp.filter(source, null);*/
}
但是,当我调用BufferedImageOp
类的 .filter 方法时,我遇到了与通道数或字节数相关的错误。上面代码的注释部分产生了这些相应的错误:
错误 #1:
Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: Number of channels in the src (4) does not match number of channels in the destination (2)
at java.awt.image.LookupOp.filter(LookupOp.java:273)
at java.awt.image.LookupOp.filter(LookupOp.java:221)
错误 #2:
Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: Number of color/alpha components should be 4 but length of bits array is 2
at java.awt.image.ColorModel.<init>(ColorModel.java:336)
at java.awt.image.ComponentColorModel.<init>(ComponentColorModel.java:273)
at java.awt.image.LookupOp.createCompatibleDestImage(LookupOp.java:413)
链接中的代码很旧,(它是在 1998 年编写的!)所以我认为从那时起发生了一些变化,这就是代码不再有效的原因。但是,我还没有找到几乎同样能解释这个概念的另一个来源,这是我最关心的问题。
谁能解释这些错误的含义以及如何解决它们?或者更好的是,给我指出一个关于如何操作图像的更新但仍然全面的教程?